溢流面板坝泄流脉动压强特性及其概化设计

Characteristics and Generalization Design of the Fluctuating Pressure of Overflow Slab Dam

依据模型试验观测的数据,对溢流面板坝泄槽的脉动压强特性进行了分析,结果表明:设有多道叠瓦形掺气槽的溢流面板坝泄槽,底板上的脉动压强和脉压系数沿泄槽顺流向下以波峰和波谷交替的形式出现;脉动能量主要集中在低频区内,出现的脉动压强谱密度主要有低频窄带和具有低频优势分量的宽带噪声谱两种类型。为便于对近似泄流条件下同类型泄槽脉动压强的效应进行分析与估算,提出了溢流面板坝泄槽脉动压强谱密度概化和脉动压强时域荷载的构造方法。

According to the model test data,the pulsating pressure characteristics of the overflow slab dam were analyzed. The results show that the pressure of the overflow plate,the pulsating pressure and the pulse pressure coefficient along the chute down along the waves and troughs alternately appear in the form. The pulsating energy is mainly concentrated on the low frequency region,and the pulsating pressure spectral density mainly has two types： low frequency narrow band and broadband noise spectrum with low frequency dominant component. In order to facilitate the analysis and estimation of the effect of the same type of discharge pressure under the same discharge condition,the generalization of the spectral density and the time-domain load of the pulsating pressure are discussed.